5156631-UIM-G-0417
10
Johnson Controls Unitary Products
FIELD CONNECTIONS POWER WIRING
1.
Install the proper size weatherproof disconnect switch outdoors
and within sight of the unit.
2.
Remove the screws at the top and sides of the corner cover. Slide
the control box cover down and remove from unit.
3.
Run power wiring from the disconnect switch to the unit.
4.
Route wires from disconnect through power wiring exit provided
and into the unit control box as shown in Figures 1 and 10.
5.
Install the proper size time-delay fuses or circuit breaker, and
make the power supply connections.
FIELD CONNECTIONS CONTROL WIRING
1.
Route low voltage wiring into bottom of control box as shown in
Figure 10. Make low voltage wiring connections inside the low volt-
age box per Figure 12.
2.
The complete connection diagram and schematic wiring label is
located on the inside surface of the unit service access panel.
3.
Replace the control box cover removed in Step 2 of the FIELD
CONNECTIONS POWER WIRING procedures.
4.
All field wiring to be in accordance with national electrical codes
(NEC) and/or local-city codes.
5.
Mount the thermostat about 5 ft. above the floor, where it will be
exposed to normal room air circulation. Do not place it on an out-
side wall or where it is exposed to the radiant effect from exposed
glass or appliances, drafts from outside doors or supply air grilles.
6.
Route the 24-volt control wiring (NEC Class 2) from the outdoor
unit to the indoor unit and thermostat.
DEHUMIDIFICATION CONTROL (Typical)
The indoor unit Installation Manual instructions for the air handler or fur-
nace describe the interface with the outdoor heat pump. A dehumidifi-
cation control accessory 2HU16700124 may be used with variable
speed air handlers or furnaces in high humidity areas. This control
works with the variable speed indoor unit to provide cooling at a
reduced air flow, lowering evaporator temperature and increasing latent
capacity. The humidistat in this control opens the humidistat contacts as
the humidity rise. Installation instructions are packaged with the acces-
sory. Prior to the installation of the dehumidification control, the humidi-
stat jumper must be set to ‘YES” on the indoor variable speed air
handler or furnace control board.
During cooling, if the relative humidity in the space is higher than the
desired set point of the dehumidification control, the variable speed
blower motor will operate at lower speed until the dehumidification con-
trol is satisfied. A 40-60% relative humidity level is recommended to
achieve optimum comfort.
If a dehumidification control is installed, it is recommended that a mini-
mum air flow of 325 cfm/ton be supplied at all times.
To see connection diagrams of all UPG equipment, the “Low Voltage
System Wiring” document is available online at www.upgnet.com in the
Product Catalog Section.
INDOOR CUBIC FEET PER MINUTE (CFM) SELEC-
TION BOARD SETTINGS (Typical)
Refer to the indoor unit Installation Manual instructions for the air han-
dler or furnace interface with the outdoor heat pump. Refer to the Out-
door Technical Guide for the recommended indoor air flow settings of
each specific heat pump. For the system to operate correctly, ensure
that the indoor CFM Selection control jumpers are properly set. Set the
indoor cooling fan speed per the instructions for the air handler or fur-
nace by selecting the correct COOL and ADJUST (or ADJ) taps. Verify
the indoor airflow by using the LED display on the indoor CFM selection
board.
FIGURE 12:
Outdoor Unit Control Box (Single Phase)
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NOTICE
To eliminate erratic operation, seal the hole in the wall at the thermo-
stat with permagum or equivalent to prevent air drafts affecting the
operation of in the thermostat.
